Double-phase high-strength and high-plasticity titanium alloy with heterogeneous laminated structure and preparation method thereof

A laminated structure and titanium alloy technology, applied in the field of metal materials, can solve problems such as hindering the development of metastable β titanium alloy, decreasing elongation and work hardening rate, and difficult to control the content of precipitated α phase.

Active Publication Date: 2021-07-27
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the content of the precipitated α-phase is difficult to control, and when the matrix is ​​stable, the deformation mechanism will change to dislocation slip at this time, and the elongation and work hardening rate will de

Method used

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  • Double-phase high-strength and high-plasticity titanium alloy with heterogeneous laminated structure and preparation method thereof
  • Double-phase high-strength and high-plasticity titanium alloy with heterogeneous laminated structure and preparation method thereof
  • Double-phase high-strength and high-plasticity titanium alloy with heterogeneous laminated structure and preparation method thereof

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preparation example Construction

[0037] A method for preparing a dual-phase high-strength and high-plasticity titanium alloy with a heterogeneous laminated structure, comprising the following steps:

[0038] Step 1. Heat the titanium alloy in the β single-phase region at 1000-1200°C in a muffle furnace for 1-2 hours, and then quench it to room temperature to obtain a uniform β-phase;

[0039]Step 2, heating the alloy obtained in step 1 to a temperature above the transformation point again, and rolling after keeping the temperature for 10-20 minutes.

[0040] The temperature of the phase transition point is 760±5°C, the heating temperature is from the phase transition point temperature to 10°C above the phase transition point temperature, and the heating temperature is 765-775°C.

[0041] Step 3. The titanium alloy obtained in step 2 is rolled across β, and the rolling reduction in a single pass is 4 to 10% of the rolling deformation. After each 1 to 2 passes of rolling, the temperature is lower than the phase...

Embodiment 1

[0055] A dual-phase TRIP / TWIP titanium alloy with a heterogeneous laminated structure and a hot rolling method thereof, comprising the following steps:

[0056] Step 1. Heat the 9mm thick Ti-Al-Mo-Cr-Zr metastable β-titanium alloy plate in a muffle furnace at 1000°C for 60 minutes, and then quench it to room temperature;

[0057] The composition of Ti-Al-Mo-Cr-Zr metastable β titanium alloy is 0.5-1.5% Al, 8-9% Mo, 2.5-4% Cr, 3-4% Zr, and the balance is Ti and Some other unavoidable impurities.

[0058] Step 2, heat the 9mm thick Ti-Al-Mo-Cr-Zr metastable alloy plate at 770°C for 10min in a muffle furnace;

[0059] Step 3. Take it out for rolling. The reduction in a single pass is 5%. After every two passes of rolling, the sample is returned to the furnace and kept at 770° C. for 1 min. The total rolling reduction is 90%.

[0060] Step 4. Immediately put the rolled sample into a muffle furnace, keep it at 770° C. for 1 min, and then quench it to room temperature to obtain a ...

Embodiment 2

[0064] A dual-phase high-strength and high-plasticity TRIP / TWIP titanium alloy with a heterogeneous laminated structure and a hot rolling method thereof, comprising the following steps:

[0065] Step 1. Heat the 9mm thick Ti-Al-Mo-Cr-Zr metastable β-titanium alloy plate in a muffle furnace at 1000°C for 60 minutes, and then quench it to room temperature;

[0066] The composition of Ti-Al-Mo-Cr-Zr metastable β titanium alloy is 0.5-1.5% Al, 8-9% Mo, 2.5-4% Cr, 3-4% Zr, and the balance is Ti and Some other unavoidable impurities.

[0067] Step 2, keeping the 9mm thick Ti-Al-Mo-Cr-Zr metastable β-titanium alloy sheet in a muffle furnace at 770°C for 10 minutes;

[0068] Step 3. Take it out for rolling. The reduction in a single pass is 5%. After every two passes of rolling, the sample is returned to the furnace and kept at 770° C. for 1 min. The total rolling reduction is 90%.

[0069] Step 4. Immediately put the rolled sample into the muffle furnace, hold it at 770°C for 3 min...

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Abstract

The invention discloses a double-phase high-strength high-plasticity titanium alloy with a heterogeneous laminated structure and a preparation method thereof. The alloy is subjected to heat preservation for 1-2 h in a beta single-phase region at the temperature of 1000-1200 DEG C in a muffle furnace and then quenched to the room temperature to obtain a uniform beta phase, the obtained alloy is heated again to the temperature above a phase transformation point, heat preservation is conducted for 10-20 min, then rolling is conducted, and finally, a plate obtained through rolling is subjected to heat preservation for 1-10 min at the temperature 10 DEG C higher than the phase transformation point and then quenched to the room temperature, and the double-phase TRIP titanium alloy with the heterogeneous laminated structure is obtained. The two-phase TRIP titanium alloy with the heterogeneous laminated structure prepared by the method can obtain mechanical property combinations of the yield strength of 875 MPa, the elongation at break of 28%, the yield strength of 702 MPa and the elongation at break of 48.5%, and the yield strength of 595 MPa and the elongation at break of 45%.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a dual-phase high-strength and high-plasticity titanium alloy with a heterogeneous laminated structure and a preparation method thereof. Background technique [0002] The consumption of fossil fuels and other energy sources can be significantly reduced through the use of new high-strength ratio and lightweight structural materials. Titanium alloys are important lightweight structural materials whose excellent combination of strength and ductility can be obtained by tuning their microstructure. Compared with β-phase and α+β two-phase titanium alloys, metastable β-titanium alloys exhibit better hardenability, not only have good matching of plasticity, strength, fatigue resistance and excellent deformation processing performance, but also have high Excellent corrosion resistance, so it has great application prospects. In general, the phase stability of metastable β-titanium alloys c...

Claims

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Application Information

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IPC IPC(8): C22F1/18C22C14/00
CPCC22F1/183C22F1/002C22C14/00
Inventor 张金钰张崇乐包翔云刘刚孙军
Owner XI AN JIAOTONG UNIV
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